from what i saw i think that Xiang ( blue ) is the seme and Guang ( orange ) is the uke because Xiang was topping Guang. anyway, here's the extra chapter where they get down to business~✧:
http://www.kuaikanmanhua.com/web/comic/26859/
omg wtf youre alive omg ( ̄ε(# ̄)Σ wait the chapters where yuyang and lihuan met lin xiang ang guang...the part where they ate together and guang kinda became yuyang and lihuans wingman and theres this panel where guang was like dont worry man i got you were both tops he said that to lihuan(but like chibi versions) lmaoooo
So in the latest chapter they're about to have sex but I can't open the chapter for some reason. Mind anyone tell me who the uke is? I really want the blue eye to be the uke tho